Patent US4025193A successfully refreshed from Google Patents.
Patent US2401826A successfully refreshed from Google Patents.
US2401826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine
Assignee: De Havilland Aircraft Co Ltd
•
Filing: 1943-07-20
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Granted: 1946-06-11
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Expires: 1963-07-20
Abstract
No abstract record available.
Inventors
- 👤 Halford Frank Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:42
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/02; F01D5/021; F01D5/08; F01D5/085; F01D5/087; F01D5/30; F01D5/3069; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-06-10 | 1949-12-10 | 1950-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-06-10 | 1953-12-10 | 1954-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-06-10 | 1957-12-10 | 1958-06-11 | $7700.00 | Window Closed / Lapsed |